You can see an image of an Iranian visa here. There are some information printed on the visa which are not in English. Those details are explained below.
Personal information on the visa are intentionally blurred.

1 Visa holder’s name in Farsi
2 Allowed duration of stay (in days)
3 Number of allowed entries
4 Number of accompanying persons
5 Visa validity expiry date
6 Visa validity starting date
7 Visa Type